N₂O Patient Position — NDEB AFK MCQ
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Correct answer: E — Semi-reclined position (approximately 30-45° head elevation)
The semi-reclined (semi-supine) position at approximately 30-45° head elevation is recommended for nitrous oxide sedation. This position facilitates comfortable nasal breathing, allows natural drainage of secretions, and reduces the risk of aspiration. The completely supine position is avoided because N₂O is heavier than air and pools in the mask; the upright position makes it harder for the patient to relax. The nasal hood should be properly fitted to minimise room air entrainment and occupational exposure to waste N₂O.
Reference: Malamed – Sedation: A Guide to Patient Management, 6th ed., 2018